Patent US2988659A successfully refreshed from Google Patents.
US2988659A
Expired / Lapsed
US
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Electron beam focusing magnet system for traveling wave tubes
Assignee: US Philips Corp
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Filing: 1959-06-04
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Granted: 1961-06-13
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Expires: 1979-06-04
Abstract
No abstract record available.
Inventors
- 👤 Deimel Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:08
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/0876
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2591350A
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FR1080230A
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US2741718A
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US2797360A
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US2867745A
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US2812470A
Cited
GB792002A
Cited
US2871395A
Cited
US2876373A
Cited
US2791718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |